Will marathon be harmful to health?

From a medical point of view, running a marathon is a sport that challenges the limits of the human body for most ordinary people. After all, it's a long journey. If you lack exercise at ordinary times, it will definitely hurt. Practice the marathon step by step, and let your body adapt slowly. I don't usually practice middle and long distance running, but I will have a marathon at once. Both men and women may have ketonemia and ketonuria when consuming and decomposing fat in large quantities, which is harmful to the kidneys. Coupled with excessive fatigue, it is easy to cause muscle and joint injuries. Excessive sweating may also lead to electrolyte imbalance. Some people even ran a marathon and died suddenly. You can get hurt in any sport, not just the marathon. Exercise advice must be done step by step and according to your own ability.